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Why do we vaccinate people - how does it work?

Vaccination is an important method used in healthcare to prevent people from getting certain diseases. Vaccines contain a dead or weakened ( attenuated) form of a pathogen, and the immune system responds to ...
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Answered by Ella S. • Biology tutor
4302 Views

Rationalising the denominator (Surds)

When asked to rationalise simple Surd (square roots that cannot be reduced to a whole number) fractions in the form a/√b we are aiming to remove the surd in the denominator (bottom).-------------------------...
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Answered by Galen Y. • Maths tutor
20840 Views

Name the major organs of the Gastrointestinal tract

Oral cavity, Oesophagus, Stomach, duodenum, jejunum, ileum, colon, rectum, anus.
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Answered by David B. • Biology tutor
3256 Views

How is a waterfall formed in a river?

A waterfall forms in the upper course of a river. The water here flows over hard and soft rock. The soft rock is eroded more quickly than the hard rock. The river undercuts the hard rock leaving an overhang ...
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11090 Views

In French, when should I employ the imperfect tense?

The imperfect tense is a PAST tense and, (in French) is used to talk about three past things: - To describe a scene, for example the weather: “il FAISAIT beau”. - To describe something that was done regularl...
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Answered by Fern C. • French tutor
4112 Views